Treesearch

In attempts to find a chestnut tree that is resistant to the blight fungus Endothia parasitica, Asiatic chestnuts have been imported and grown in this country, and tree breeders have worked to produce hybrid trees that might be suitable substitutes for the blight-susceptible American chestnut, Castanea dentate, in timber and nut production.

In Pennsylvania and New York there are 2,350,000 acres of plantable land that could be utilized for growing timber for future needs. Much of this plantable land lies on the Allegheny Plateau - a region that is eminently suited to growing black cherry (Prunus serotina Ehrh.). On the Allegheny National Forest alone, 26,000 acres are classed as plantable. Besides this, the even-aged management program recently adopted on the Forest calls for clearcutting about 3,000 acres each year. Although these cut areas are expected to regenerate naturally for the most part, some of the acreage very...

The production of maple sugar and maple syrup from the sap of the sugar maple tree (Acer saccharum Marsh.) is an important industry in the Northeast, particularly in Vermont and New York. Although it has been recognized for a long time that some trees are sweeter than others - have a higher sugar content in their sap - systematic study of ways to improve sugar production by this species was begun only rather recently.

Although sweetgum (Liquidambar styraciflua L.) is one of the most valuable hardwoods in bottomland forests from southern New Jersey and southern Illinois southward, relatively little is known about its production and distribution of seed. Knowledge of both is essential in planning successful measures for reproducing the species. To provide some of the needed information, the Northeastern Forest Experiment Station studied the production and distribution of sweetgum seed in 1962 from four New Jersey stands.

During the period 1946-49, The Pennsylvania State University established 22 experimental plantings of trees and shrubs on strip-mine spoil banks in the Bituminous Region of Pennsylvania to determine which species were best suited for revegetating such sites. When 10-year growth on the experimental plots was evaluated, a clone of hybrid poplar was found to have outgrown all the other species tested. The performance of this one hybrid poplar suggested that other hybrid poplars might be well adapted for growing on strip-mine spoils, so we planned a screening test of as many hybrid poplar...

Although infrequently used, the trough-type rain gage has been described as aerodynamically the most efficient of gages (Hayes and Kittredge 1949). This applies only to the commercial semicircular eave-gutter type of trough and not to troughs rectangular in cross-section. The latter, as well as the upright cylindrical type of gage, produces greater disturbances in the rain-bearing wind stream.

The automatic recording of wind movement is sometimes essential to experiments in forestry and watershed-management research. Wind-movement data are often obtained by periodic reading of the anemometer dial, but occasionally data are required for variable intervals and at times when observations cannot be made easily. Instruments designed to record wind movement are being manufactured, but they are multiple-stage recorders and are expensive. To our knowledge, no instrument is made for the sole purpose of recording wind movement. So we devised an easy and inexpensive way to convert any...

The name "Collar crack" is suggested for a condition of birches observed in the past 4 years during field studies of forest disease problems in the White Mountains of New Hampshire. The first close observations of this condition were made during the summer of 1963. This is a report on those observations and an explanation of the possible cause.

In April of 1953 the Lake States Forest Tree Improvement Committee was formed, following a regional conference sponsored by the Lake States Forest Experiment Station. Since that time there has been a marked increase in the amount of tree improvement work done in this region, and the Committee has performed a valuable service in encouraging and coordinating such activities. Since that first conference, the Lake States Forest Tree Improvement Committee has conducted regional tree improvement conferences biennially. For each conference there has been a proceedings, and the Station has...

To provide up-to-date information about the forest resources of the Nation, the Forest Service, U. S. Department of Agriculture, conducts a series of continuing forest surveys of the various states. This is a report on the latest forest resurvey of West Virginia, made by the Northeastern Forest Experiment Station. It supersedes a report published in 1952, which contained forest-resource data based on an earlier survey made by the Northeastern Station. In this resurvey, a scientifically designed sampling system, partly based upon remeasured plots, was used. Data were collected and analyzed...